UNIT V
Distinguishing features of popular released varieties in – Rice, maize, pearl millet, sorghum, pigeonpea, urd bean, moong bean, cotton and their application to DUS testing - Maintenance of seed purity - Nucleus and Breeder Seed Production.Maintenance Breeding and All India Co- ordinated System of testing and release of crop varieties and hybrids.

Practicals
Floral biology – emasculation - pollination techniques; Study of variation for yield and yield components - Trait based screening for stress resistance in important crops– Use of descriptors for cataloguing Germplasm maintenance; Using Standard Evaluation System (SES) and descriptors, Field and lab visit of the concerned crops